The ultrasound probe includes an error correcting code generating unit to generate error correcting codes corresponding to the ultrasound data, adds the error correcting codes generated by the error correcting code generating unit to the ultrasound data so as to produce transmission data, and transmits the transmission data to the processing unit. The processing unit includes an error correcting unit to perform error correction processing for the ultrasound data based on the error correcting codes contained in the transmission data, and an error ratio detecting unit to detect an error ratio of data in the ultrasound data contained in the transmission data, and transmits information corresponding to the error ratio detected by the error ratio detecting unit to the ultrasound probe. The error correcting code generating unit changes a ratio of error correcting codes to the ultrasound data in accordance with the error ratio received by the ultrasound probe.
